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- Cabinet Rack: Doors front and rear locking with mesh. Width: 19". Height: 42U is most common. Depth: 42" is most common. Rack must support at least 2,000 lbs static load
- https://greatcabinets.com/product/es-ms/ This is what we usually get
- https://www.apc.com/shop/us/en/products/APC-NetShelter-SX-Server-Rack-Enclosure-42U-Black-1991H-x-600W-x-1070D-mm/P-AR3100 APC NetShelter SX
- https://www.apc.com/shop/us/en/products/APC-NetShelter-SX-Server-Rack-Enclosure-42U-Shock-Packaging-2000-lbs-Black-1991H-x-600W-x-1070D-mm/P-AR3100SP APC NetShelter SX designed for re-shipping after equipped.
- PDU: one PDU or two PDUs? What plug? What voltage? This may very across sites. What if the site has two power sources?
- https://www.apc.com/shop/us/en/products/APC-Rack-PDU-2G-switched-0U-30A-100V-to-120V-24-NEMA-5-20R-sockets/P-AP8932 24 NEMA 5-20R, 120V, 2.8kW, NEMA L5-30P 1Phase
- https://www.apc.com/shop/us/en/products/APC-Rack-PDU-9000-switched-0U-8-6kW-208V-21-C13-and-C15-3-C19-and-C21-sockets/P-APDU9965 21 C13/C15 and 3 C19/C21, 208V, 8.6kW, NEMA L21-30P 3Phase
- https://www.apc.com/shop/us/en/products/APC-Rack-PDU-9000-switched-0U-17-3kW-208V-42-C13-and-C15-6-C19-and-C21-sockets/P-APDU9967 42 C13/C15 and 6 C19/C21, 208V, 17kW, IEC60309 60A 3P+PE 3Phase
- Stagger startups on PDU
- UPS: for just the head node and switch? This may depend on the voltage of the PDUs.
- Switch: 10Gb/s.
- Environmental Monitoring: Could the PDU do this?
- KVM: rackmount, not remote, and patch cables
- Ethernet cables:
- Power cables: single or Y calbes depending on number of PDUs and two power sources.
- Head Node: lots of disk. Do the locals have access to this disk space? Maybe not.
- How many RAID arrays (OS, diskless images, data)?
- How many RAID volumes (OS, diskless images, nrao-data, local-data)
- 30 1U nodes or 15 2U nodes or mix? NVMe drives for nodes. Swap drive?
- GPUs: Do we get GPUs? Do we get 1U nodes with room for 1 or 2 Tesla T4 GPUs or 2U nodes with room for 1 or 2 regular GPU?
Documentation
- A projectbook like we did for USNO could be appropriate
- Process diagrams (how systems boot, how jobs get started from NRAO and run, how locals start jobs, etc)
Other
Keep each rack as similar to the other racks as possible.
Since we are making our own little OSG, should we try to leverage OSG for this or not? Or do we want to make each POD a pool and flock?
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Using
- Get NRAO jobs on the remote racks
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- . This may depend on how we want to use these remote racks.
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- If we want them to do specific types of jobs then ClassAd options may be the solution. If we want them as overflow for jobs run at NRAO then flocking may be the solution.
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- Actually flocking may be the best method because I think it doesn't require the execute nodes to have external network access.
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- Flocking?
- Classad options?
- Other?
Remote HTCondor concerns
- Do we want our jobs to run a an NRAO user like vlapipe or nobody?
- Do we want local jobs to run as the local user, some dedicated user, or nobody?
- Need to support 50% workload for NRAP and 50% workload for local. How?
- Could have 15 nodes for us and 15 nodes for them
- What if we do nothing? HTCondor's fair-share algorithm may do the work for us if all our jobs are run as user vlapipe or something like that.
- Use RANK, and therefore preemption. https://htcondor-wiki.cs.wisc.edu/index.cgi/wiki?p=HowToConfigPrioritiesForUsers
- Group Accounting
- User Priority https://htcondor-wiki.cs.wisc.edu/index.cgi/wiki?p=HowToSetUserPriority
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- Share disk space on
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- head node
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- 50% NRAO and 50% local
- Two volumes: one for NRAO and one for local?
Remote HTCondor concerns
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Documentation
- A projectbook like we did for USNO could be appropriate
- Process diagrams (how systems boot, how jobs get started from NRAO and run, how locals start jobs, etc)
Other
- Keep each rack as similar to the other racks as possible.
- Test system at NRAO should be one of everything.
Since we are making our own little OSG, should we try to leverage OSG for this or not? Or do we want to make each POD a pool and flock
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?
Should we try to buy as much as we can from one vendor like Dell to simplify things?
APC sells a packaged rack on a pallet ready for shipping. We could fill this with gear and ship it. Not sure if that is a good idea or not.Test system at NRAO should be one of everything.
Resources
- USNO correlator (Mark Wainright)
- VLBA Control Computers (William Colburn)
- Red Hat maintenance (William Colburn)
- Virtual kickstart (William Colburn)
- HTCondor best practices (Greg Thain)
- OSG (Lauren Michael)
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